Spring-released transmission-housing-cover-locking means



March 17, 1925.

' c. L. JOHNSON SPRING RELEASED TRANSMISSION nousme COVER LOCKING MEANS Fil y 15, 1922 Patented Mar. 17, 1925.

UNITED STATES 1,529,743 PATENT o c COLVIN I. JOHNSON, OF ST. LOUIS, MISSOURI, ASSIGNOR TO JOHNSON AUTOMOBILE LOG'K (30., A CORPORATION OF ILLINOIS.

SPRING-RELEASED TRANSMISSION-HOUSING-COVER-LOCKING MEANS.

Application filed July 15, 1922. Serial No. 575,382.

To all whom it may concern:

Be it known that I, COLVIN L. JoHNson, a citizen of the United States, and a resldent of the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in a Spring-Released Transmission Housing Cover Locking Means; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates to spring-released transmission housing cover locking means, and particularly to means which are adapted to prevent the removal of the cover from a transmission housing or caslng when the transmission gears are in a predetermined position. v

In order to prevent the theft or unauthorized use of motor vehicles and other gear operated mechanisms, it is customary in many cases to lock the transmission gears thereof in a neutral or inoperative position by means of locking devices which are associated with the gear shift lever or otherwise. While such locking means are highly successful in attaining their desired pur pose, it IS nevertheless posslble 1n certalncases to remove the transmission housing cover and the gear locking means, after which the gears may be shifted mto operative position and the vehicle or other mechanism operated.

It is an object therefore of the present invention to provide means. which are adapted to be associated with a gear shift locking device for locking the cover on a transmission housing.

It is another object of this invention to provide spring released transmission housing cover locking means which are moved into and maintained in looking position by a gear shift locking means.

It is also an important object of this invention to rovide means associated with the transmission mechanism which are ing means and the housing cover locking means associated therewith.

Figure 2 is a slightly enlarged section on the line k2 of Figure 1 ,with parts omitted. V

Figure 3 is an enlarged fragmentary section on the line 33 of Figure 2. I

As shown on the drawings:

The reference numeral 1 indicates a transmission housing or casing in which a usual change speed transmission mechanism is mounted. Mounted upon the upper edge of sald housing or casing 1, is an inwardly extending flange 2to which the transmission housing cover is secured, means of machine screws 3 in the usual manner. Said cover comprises a flange at. through which upwardly at the center of the casing from said horizontal portion 5, is a dome portion 6 which affords at 7 a universal support for a gear shift lever .8 which is provided with a depending portion 9jextendingdownwardly therefrom throughthe interior of. the dome portion. k

Extending longitudinally vof the casing -1 are parallel guide rods 10, on which are slid ably mounted blocks 11 having oppositely positioned notches or cutaway portions in thelr inner faces andhaving integral therewith and depending therefrom gear shifting forks 12 of usual design.

.Extending longitudinally of the casing v1 and secured to the inside of the horizontal portion 5 of the cover for the casing 1 are parallel longitudinal members 13, each of which is provided with an integral depending flange 14:, and formed in said flanges 14: are oppositely positioned apertures 15. which slope downwardly and outwardly as clearly shown inFigures 1 and 3. Said longitudinal members 13 are secured to the inner faces of the horizontal portions 5 by weldlng or in any other manner whereby access thereto from the outside of the casing I is prevented. Formed in the blocks 11 adin each of said recesses 16 is a cylinderl'? h Q is no m ly: eldga t h n e end of the recess by means of a'coi-l; spring 18 engaged in said recess between the outer end of the'cylindriealiblock' 17 andrthe inner end of a plug 19 threaded in the outer end of said recess 16. Integral with each of the cylindrical blocks and extending agi uy' through the springs 18 are pins 20.

which are slid-ably engaged t'h'rough: the plugs 19 and the roundedf end'sof whieh are adapted tohe engaged throughltheapertures 15; whenlsa idf block 17 and: pins-"2O are forced and inembers 13 consequently thefoover to the blocks 11 and rods 10, and the reby locking the cover from'movement' relative to the caising'l. Integral With the cylin drieal block ,17 and extending inwardly through 'reduiced' passages fo rmed in; the

blocks 11 and icom'muni'cating with the recesses 16 are pins 21 whichf normallyextend beyond sloping faces 22 formed on the upper andinner sides of the blocks 11. Means assoiated'wfth the mean for looking {the gear shift mechanism are provided forforoing the'pins .20 outwardly through the apertures 15' and lockingthe' same: in such position to. prevent the unauthorized removal of the. cover for-the c asing '1. Said meanscomprise a block 23 which is slidably ounte o it d p n Por n: 9. h

gear shift lever andvvhich is adapted tube reciproeated on said depending portion, by a verti'oal'member 24:"se'ou'red thereto and opably mounted on the lever for locking the 1 same from movement and looking the forks in a predetermined position, and lmea-ns associated sl'i'dably mounted means for locking-said-eover on the casing when saltl'f';

v s so 2;: combination with; a "casing, of" transmission gear shifting forks-therein; a

means are in' looked position.

lever for s hiftingsaid forks, acover-on the casing supporting sai'dlever, means slid-E ably mounted? on the lever for; locking the I same from movement means associated with said sll'da-bly mounted means forlocking said cover on the casing when saidmeanS' are in loeked' position, and resilient means forv render ng saldlcover locking means normally inoperative.

The, combination with a casingof transmission gear shiftingforks therein, a lever for shifting said forks, a cover on the casing, means slidable. on the lever for lock-f ingthelever from movement, and means as- 'sooi'ated with said lever locking means for lockingsaidcover on the casingvvhen said leyer: loeking means are in locked position.

4. The combination with a casing, of transmission" gear 7 shifting forks 1 therein,- means for shifting saidpfork's," a cover on I we erated by a lookingmechanism 25 mounted the casing, key operated means on the shift on' the} gear shift lever above the dome, shaped portion 6 of the casing cover; Said ok g member 25. i 7 ad pted to" :be rotat d into looked fpesition by means ofa suitable key inserted in the slot 26; and when rotated. to such locked positionthe member 23 is moyed downwardly .until' inwardly sloping faces: 27" formed thereon contact with the faces 22 on theblooks 11, thus iforcing the P ns 20 twar ly thro gh pe ur spreventingg removal of the-casing cover and at the same time 'preventing;lateral move; ment of the depending portion of thelever, and consequently preventing the shifting of the gears from neutral position;

It fis' thus apparent that this invention provides means Whichare adapted to be assooiated' 'With' the locking means forthe gear shiftingd'evice and Whichact, When said locking'means are in lockedfposition, to look a; cover in position on, a casing or housing f he gears h reby Pre n Lu au kized removal of the cover and the shifting;

of the gears into operative position,

11am aware that n unerous deta l's of con stri fctipn' "may be varied through a wide;

range Without departing from the principles lngmeans for locking said shifting means on the casing,

erated by said locking means the cover on the, casing.

, 6 The 00 111 11man n with a ca ing, of

transmission 7 gear' shifting forks therein,

means for shifting said forks, a cover'on' the casing, apertured means secured to the inside of the covera nd depending therefrom, and means associated with the fork shifting means adapted to be engaged through the apertures in said last mentioned meansto lock the cover on the casing v 7'. The combination -Wltl'l a casing, of

itransmissionz gear shifting forks therein,

means for shifting said forks, a'eover on in inoperative position, and me s bl by said locking means: for locking the COVBl'f theicasing, apertured means securedfltothe inside of the cover and depending therefrom, and spring retracted-pins associated with the fork shifting meansand adapted to be engaged through the apertures in said last mentioned means to lock the cover on the casing.

8. The combination with a casing, of transmission gear shifting forks therein, means for shifting. said forks, a cover on the casing, means slidable on the shifting means for locking said shifting means in inoperative position, and slidably mounted spring retracted means for locking the cover on the casing, said means being adapted to be moved' into operative position by the slidable means on said shifting means.

In testimony whereof I have hereunto l5 subscribed my name in the presence of two subscribing Witnesses.

v COLVIN L. JOHNSON. \Vitnesses:

CARLTON HJLL,

OSCAR HARTMANN. 

